For a more convenient display of the objects in the Model view, it is possible to adjust image brightness and contrast in Set Brightness dialog window available from menu Tools.
This tool only sets brightness and contrast for displaying in Model view, these parameters will not be taken into account when exporting.
Use Raster Calculator tool to apply the brightness/contrast change to orthomosaic, which can be exported with the changes applied. The workflow and an example are described in the article below.
Setting up brightness and contrast for orthomosaic export
B1 = (B1 * brightness) /256 * contrast + 0.5 * (1 - contrast)
The formula is used for the desired channel, for RGB images you need to specify the formula for each channel (below are two examples: one for RGB and one for LWIR images).
Example 1 (RGB)
For 110% brightness use 1.1 value and for 180% contrast use 1.8 value.
Example 2 (LWIR)